The acoustical manifold is presented as a device for improving the performance of high-level concert sound reinforcement speaker systems. Recently developed bass, midbass, and high-frequency devices are discussed, each of which effectively sums the output of four loudspeakers, producing from the four a single coherent source. The advantages of manifolds over multiple sources are improved audience coverage, reduced polar response lobing, small-frontal area arrays, small transportable enclosures, and in certain cases reduced distortion and increased efficiency.
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